A ball is projected upward at time = 0.0 s, from a point on a roof 30 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is Consider all quantities as positive in the upward direction. The average velocity of the ball, during the first is closest to.
A closed cylindrical tank has a height of 0.71 m. The tank is initially filled with air at a pressure of 2.0 atm. Water is pumped into the tank until the air pressure reaches 4.0 atm. The temperature is constant. Determine the height of the compressed air.